151403

Appears in sequences

• Irregular triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k isolated fixed points.at n=27A184178
• Number of permutations of {1,2,...,n} having no isolated fixed points. A fixed point j of a permutation is said to be isolated if neither j-1 nor j+1 is a fixed point. For example, 4135267 has only 3 as an isolated fixed point.at n=9A184179
• a(n) is the least number m such that u defined by u(i) = bigomega(m + 2i) satisfies u(i) = u(0) for 0 <= i < n and u(n) != u(0), or -1 if no such number exists.at n=8A356855
• Numbers k such that k, k + 2, k + 4, k + 6, k + 8, k + 10, and k + 12 are all triprimes (A014612).at n=1A367841